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Full Discussion: Perl Hashes, reading and hashing 2 files
Top Forums Shell Programming and Scripting Perl Hashes, reading and hashing 2 files Post 302292846 by silkiechicken on Sunday 1st of March 2009 07:37:42 PM
Old 03-01-2009
Perl Hashes, reading and hashing 2 files
So I have two files that I want to put together via hashes and am having a terrible time with syntax. For example:

Code:
File1

A    apple
B    banana
C    citrus

Code:
File2

A    red
B    yellow
C    orange

What I want to enter on the command line is:

Code:
program.pl File1 File2

And have the result print out

Code:
A    apple    red
B    banana    yellow
C    citrus    orange

What I have been trying to write up in Perl, is a program that is basically as follows :

Code:
foreach line in ARGV[0]
    split the line by tabs
    assign key and value

foreach line in ARGV[1]
    split the line by tabs
    assign key and value

for each key from ARGV[0]
    print key, value, ARGV[1](key)


The code that I've been trying to troubleshoot is:

Code:
  1 #!/usr/bin/perl -w
  2 use diagnostics;
  3 use warnings;
  4 
  5 %affyMap = ();
  6 %affyAnnot = ();
  7 @map = <$ARGV[0]>;
  8 @annotation = <$ARGV[1]>;
  9 $line = "";
 10 
 11 foreach $line (@map){
 12         chomp($line);
 13         my($ID,$info) = split(/\t/,$line,2);
 14         $affyMap{$ID} = $info;
 15 }
 16 
 17 foreach $line (@annotation){
 18         chomp($line);
 19         my($ID,$info) = split(/\t/,$line,2);
 20         $affyAnnot{$ID} = $info;
 21 }
 22 
 23 foreach $key (%affyMap){
 24         print "$key\t" . "$affyMap{$key}\t" . "$affyAnnot{$key}\n";
 25         }

However, when I put a print in the while statement, it doesn't seem to be even making a hash at all since it only reports one "print". I suspect the issue is with the way I am passing in variables, but am now stumped.

I have tried replacing the "foreach $line (@map)" with a "while $line ($ARGV[0])" but it still isn't making the hash tables from what I can tell.

Any help or pointers would be awesome. Thanks!
 

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LEARN ABOUT PHP

arsort

ARSORT(3)								 1								 ARSORT(3)

arsort - Sort an array in reverse order and maintain index association

SYNOPSIS

       bool arsort (array  &$array, [int  $sort_flags = SORT_REGULAR])

DESCRIPTION

	This function sorts an array such that array indices maintain their correlation with the array elements they are associated with.

	This is used mainly when sorting associative arrays where the actual element order is significant.

PARAMETERS

	      o $array
		- The input array.

	      o $sort_flags
		- You may modify the behavior of the sort using the optional parameter $sort_flags, for details see sort(3).

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      arsort(3) example

	      <?php
	      $fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
	      arsort($fruits);
	      foreach ($fruits as $key => $val) {
		  echo "$key = $val
";
	      }
	      ?>

	      The above example will output:

	      a = orange
	      d = lemon
	      b = banana
	      c = apple

	       The fruits have been sorted in reverse alphabetical order, and the index associated with each element has been maintained.

SEE ALSO

       asort(3), The comparison of array sorting functions.

PHP Documentation Group 														 ARSORT(3)
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